fixed bug with false default values on bit columns

Author: Circuit8

lib/active_record/connection_adapters/sqlserver/schema_statements.rb

@@ -402,10 +402,12 @@ def column_definitions(table_name)
               else
                 type = case ci[:type]
                        when /smallint|int|bigint/ then ci[:_type]
+                       when /bit/ then 'smallint'
                        else ci[:type]
                        end
                 value = default.match(/\A\((.*)\)\Z/m)[1]
                 value = select_value("SELECT CAST(#{value} AS #{type}) AS value", "SCHEMA")
+
                 [value, nil]
               end
             end